545 Coast Regiment RA was formed as 7 Coast Artillery Group RA at Boston with three batteries, in October 1940. It was re-designated 545 Coast Regiment RA in June 1941. RHQ was disbanded in April 1944 with the batteries joining 512 Coast Regiment RA (TA).
Illustrations of the formation badges under which a unit served or supported are given. This is no guarantee that the unit used this formations badge.
| Oct 40 | Formed as 7 Coast Artillery Group | Boston, Lincolnshire, UK | |
| Oct 40 |  |
Northern Command | Skegness, Lincolnshire, UK |
| Jun 41 | Became 545 Coast Regiment | Skegness, Lincolnshire, UK | |
| Apr 44 | Disbanded |
Batteries
| Jun 41 | 319, 320 (Filey), 321 |
| May 42 | 318, 319, 320, 321, 351, 383 |
| Jul 42 | 318, 319, 321, 349, 350, 351 |
| Aug 42 | 318, 319, 349, 350, 351, 437 |
| Mar 43 | 318, 319, 349, 351, 437 |
| May 43 | 319, 349, 351, 437, 445 |